Stearato chromic chloride printing process



United States Patent ()flice 3,384,501 Patented May 21, 1968 ,384,501STEARATO CHROMIC CHLQRIDE PRINTING PROCESS Eames S. Crump, Mobile, Ala.,assignor to International Paper Company, New York, N.Y., a corporationof New York No Drawing. Continuation of application Ser. No.405,844,-et. 22, 1964. This application June 26, 1967, Ser. No. 649,052

2 Claims. (Cl. 106-287) ABSTRACT OF THE DISCLOSURE A process of printinga stearato chromic chloride formulation at spaced intervals on wrappingpaper by means of a printing press for the purpose of having suchformulation serve as an adhesive releasing agent where printed.

This application is a continuation of application S.N. 405,844 filedOct. 22, 1964, now abandoned.

This invention relates to a novel adhesive releasing agent. Moreparticularly, it relates to a method for providing an adhesive releasingsurface on wrapping paper or any other material otherwise subjected tocontact with an adhesive.

Recently, a major producer of shingles for roofing and the like has beenmaking such shingles with a strip of a new type of resinous adhesivealong the top side of each shingle. This strip of adhesive serves as ameans by which the overlapping shingles seal themselves together underthe influence of the suns heat and their own weight.

As might be expected, the presence of the strip of adhesive on eachshingle posed a packaging problem. Since the packaged shingles werenecessarily exposed to a certain amount of heat and pressure in storage,it transpired that the top shingle in each package of twelve stuck tothe packaging, i.e., kraft wrapping paper, and was thereby made uselessas a roofing material.

In an attempt to overcome the problem of the sticky shingles, theshingle producer developed a method of applying a latex emulsion to thewrappers for each set of twelve shingles as each wrapper was used on ashingle wrapping machine. But it was found that neither the emulsion northe machine achieved reliable or consistent results.

In the development of the present invention, it was found that not onlywas a better adhesive releasing agent needed by the shingle producer,but that he had to have it positioned precisely on the shingle wrappingmaterial in order to have the adhesive strip on the top shingle coincidewith the area treated with the adhesive releasing agent when shinglesand wrapping material came together in the wrapping machine. What wasrequired was the same order of precision as went into the positioning ofthe printing and other graphic material on the shingle wrapping paperand was felt necessary to an attractive and saleable packaging of thegoods. The consequence of this finding was the pursuit not only of abetter adhesive releasing agent, but one which could be applied by aprinting press when the graphics were imposed on the shingle wrappingpaper. Another property which was sought for the adhesive releasingagent was a non-destructive or non-deleterious compatibility with theadhesive. It would not do to find a way of packaging the shinglescleanly and, nonetheless, to destroy their efficacy.

During trials, it was found that the shingle producers latex emulsionwould not print with good result. Several other materials were tried andfound to print well, but they either released the adhesive on theshingles inadequately or attacked the adhesives scaling properties. Itwas then found that a mixture of stearato chromic chloride (commerciallyavailable under the brand name Quilon C), water, and a neutralizer didthe job well in all particulars. The adhesive releasing agent of suchmixture which was imprinted on the inner side of kraft shingle wrappersover an area of about 4" x 40 per wrapper and at a rate of about 1.23pounds of mixture per 1000 wrappers met the test of the shingleproducer, i.e., gave complete release of the adhesive from a wrapper(without impairing the end use of the adhesive) after one weeks exposureto F. in a stack of eight bundles of twelve shingles per bundle.

' Preferably, the mixture of the present invention consists of about 50%by weight of a concentrate of stearato chromic chloride in isopropylalcohol having a solids content of about 27% to 30% by weight, about47.5% be weight of water, and about 2.5 by weight of hexamethylenetetramine. It has been found that reducing the proportion of theconcentrate to about 45% by weight causes the mixture to performinadequately, but raising the proportion raises the mixtures costwithout improving its performance. The ratio of concentrate toneutralizer should be about 20 to 1 at all times.

What is claimed is:

1. A printing method comprising formulating an adhesive releasing agentprintable on paper at spaced intervals by means of a printing presswhich comprises a mixture of about 50% by weight of a concentrate ofstearato chromic chloride in isopropyl alcohol having a solids contentof about 27% to 30% by weight, above 47.5% by weight of water, and about2.5% by weight of neutralizer and printing said agent on paper at spacedintervals by means of a printing press.

2. The method of claim 1 wherein the neutralizer is hexamethylenetetramine.

References Cited UNITED STATES PATENTS 2,549,220 4/1951 McLaren 260--4382,772,141 11/1956 Dunlap 264338 2,803,557 8/1957 Martin l04l94 ALEXANDERH. BRODMERKEL, Primary Examiner.

T. MORRIS, Assistant Examiner.

